Glossary

Nyquist frequency

Beginner

Roughly the fastest wiggle a signal has to make to carry its data.

Novice

Half the symbol rate of a signal. A lane sending 53 billion symbols per second has its Nyquist frequency at about 26.6 GHz. Losses are usually quoted at this frequency.

Expert

fN=baud/2f_{\mathrm{N}} = \mathrm{baud}/2. The reference frequency for channel loss specs: 26.56 GHz for 100G PAM4 (53.125 GBd) and 53.125 GHz for 200G PAM4 (106.25 GBd).

Explained in Optics (Systems).

See also: Insertion loss.

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